Go check out this page and see how you can tell if a cashier's check you received was a forgery as well. ;3 http://www.scamvictimsunited.com/counterfeit_cashier's_check.htm
Though I ususally get personal checks or money orders from my ebay buyers, I get at least one cashiers check a month - and I have never seen one without a patterned background.
Giving Undie the benefit of the doubt, I thought it possible (for a split second) that he had just used a blank piece of paper to cover the bank name on the check while scanning it...impossible. Absolutely impossible.
Even FAKE cashiers checks have the patterned background and watermarks. I could work-up a replica of Undie's "cashiers check" in less than 5 minutes using Microsoft Word and plain white paper.